Roca toilet cistern

[Reds in the blood]

This I believe may be an old chestnut, but I would appreciate advice please.

Our toilet is a Roca cistern, with I believe Fluidmaster valve, which continues to trickle water down the pan after flushing. The cistern then tops up (taking only a few seconds) after about 10 to 15 minutes of the initial flushing.
It has twin buttons on the top centre. (Yes......I found how to get them off from this site ....many thanks!!!!! )

Coincidentally (??) my neighbours have a similar problem. (Our homes are on a 3 year old new-build housing development and we all moved in at more or less the same time.)

Is it likely that the valves are worn out?
Could high water pressure be the culprit. (The toilet cistern whistles like hell when it is filling from empty!)

How do we solve the problem???

Thanks in anticipation!!

 

[ChrisR]

which continues to trickle water down the pan after flushing.

how long for?

The cistern then tops up (taking only a few seconds) after about 10 to 15 minutes of the initial flushing.

eh?

 

[croydoncorgi]

Do you mean that the filling valve only opens 10 - 15 minutes AFTER the WC has been flushed - ie. it's sticking shut?
or that the flush valve leaks into the pan for 10 - 15 minutes after it's re-filled? ie. it's sticking open.
or something else entirely?

 

[Reds in the blood]

Apologies..........

Seems to be sticking partly open and therefore slowly emptying the cistern. This takes maybe 10 to 15 minutes and then the cistern refills.

Hope this has clarified things!

 

[ChrisR]

Take the flush valve apart and clean it. Dismal things which are cheaply made and break easily. Geberit ones are better, standard in dearer loos.

 

[Reds in the blood]

Take the flush valve apart and clean it. Dismal things which are cheaply made and break easily. Geberit ones are better, standard in dearer loos.

Thank you........Tomorrow's job sorted then!!!!!!!!!!

 

[croydoncorgi]

I had one of these flush valves leaking a couple of weeks back - but worse! There was a booster pump driving the cold supply to the whole bathroom and the inhabitants had to put up with it running for 20 seconds every 4 minutes all night, because they didn't know where to switch it off!

They were quite glad to see me next day but looked a bit haggard from lack of sleep.